where is speed sensor located on 2001 Kia Optima?

There are two sensors.
Input sensor and output sensor.

transmission output sensor. It is on top.
The transmission input sensor is located at top ot transaxle assembly. It is hidden by the air cleaner housing. Remove it to access and replace it:
The output sensor is more towards the battery tray and slightly under it:

See the diagram below :---



This will help.
Thanks.
See below latest solved car problems :---

Is the power steering dipstick near the transmission dipstick?

http://schematicsdiagram.blogspot.in/2012/02/is-power-steering-dipstick-near.html

Filling Transmission fluid on 2001 Volvo c70?

http://schematicsdiagram.blogspot.in/2012/02/filling-transmission-fluid-on-2001.html

There is no transmission dipstick located on 2003 c230 Mercedes Kompressor?

http://schematicsdiagram.blogspot.in/2012/02/there-is-no-transmission-dipstick.html

2002 Isuzu trooper Transmission fluid fill up?

http://schematicsdiagram.blogspot.in/2012/02/2002-izusu-trooper-transmission-fluid.html

Coolant enters in transmission on Toyota Land cruiser?

http://schematicsdiagram.blogspot.com/2012/01/coolant-enters-in-transmission-on.html

Engine stumbles and shuts off in forward gear on Toyota Land Cruiser?

http://schematicsdiagram.blogspot.com/2012/01/engine-stumbles-and-shuts-off-in.html

Transmission problem?

http://schematicsdiagram.blogspot.com/2012/01/transmission-problem.html

Car engine Overheats and transmission starts slipping?

http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html

Manual Transmission Clutch System Failures?

http://repairhelpcenter.blogspot.com/2011/11/manual-transmission-clutch-system.html

                                       

Automatic transmission will not go into high gear?

http://howtobyme.blogspot.com/2011/11/automatic-transmission-will-not-go-into.html

                                              

Transmission fluid gets into radiator?

http://schematicsdiagram.blogspot.com/2011/12/transmission-fluid-gets-into-radiator.html

HOW TO REPLACE A MANUAL TRANSMISSION

http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-manual-transmission.html

HOW TO REPLACE TRANSMISSION COOLER LINES

http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-transmission-cooler.html

HOW TO CHECK AUTOMATIC TRANSMISSION FLUID LEVEL

http://schematicsdiagram.blogspot.com/2011/07/how-to-check-automatic-transmission.html

HOW TO CHANGE AUTOMATIC TRANSMISSION FLUID AND FILTER

http://schematicsdiagram.blogspot.com/2011/07/how-to-change-automatic-transmission.html

HOW TO REPLACE A TRANSMISSION MOUNT

http://schematicsdiagram.blogspot.com/2011/08/how-to-replace-transmission-mount.html

How to check Transmission fluid on 1996 Chevrolet Camaro?

http://schematicsdiagram.blogspot.com/2011/12/how-to-check-transmission-fluid-on-1996.html

          

Transmission fault light on car dash?

http://schematicsdiagram.blogspot.com/2011/12/transmission-fault-light-on-car-dash.html

Car makes noise when clutch is pressed gently?

http://schematicsdiagram.blogspot.com/2011/12/car-makes-noise-when-clutch-is-pressed.html

Filled T-IV fluid instead of WS transmission fluid?

http://repairhelpcenter.blogspot.com/2012/01/filled-t-iv-fluid-instead-of-ws.html

Manual transmission very hard to shift from one gear to another?

http://repairhelpcenter.blogspot.com/2012/01/manual-transmission-very-hard-to-shift.html

Bell housing and transmission will not come apart on 1996 Toyota Tacoma?

http://repairhelpcenter.blogspot.com/2012/01/bell-housing-and-transmission-will-not.html

Transmission shifting problem on Toyota Land cruiser?

http://schematicsdiagram.blogspot.com/2012/01/transmission-shifting-problem-on-toyota.html

How to Add transmission fluid on 2002 Isuzu AXIOM?

http://technoanswers.blogspot.in/2012/02/how-to-add-transmission-fluid-on-2002.html

Transmission Slips out of 2nd gear?

http://repairhelpcenter.blogspot.in/2012/02/transmission-slips-out-of-2nd-gear.html

OD light flashing and transmission fluid leaking?

http://repairhelpcenter.blogspot.in/2012/02/od-light-flashing-and-transmission.html

Transmission fluid leaks near radiator on ford windstar?

http://repairhelpcenter.blogspot.in/2012/02/transmission-fluid-leaks-near-radiator.html

Ford Windstar transmission fluid leaking?

http://technoanswers.blogspot.in/2012/02/ford-windstar-transmission-fluid.html

Dodge neon wont go in reverse?

http://technoanswers.blogspot.in/2012/02/dodge-neon-wont-go-in-reverse.html

Dodge Automatic transmission will not go into reverse?

http://technoanswers.blogspot.in/2012/02/dodge-automatic-transmission-will-not.html

Dodge manual transmission will not go in reverse gear?

http://technoanswers.blogspot.in/2012/02/dodge-manual-transmission-will-not-go.html

Transmission is making buzzing noise?

http://technoanswers.blogspot.in/2012/02/transmission-is-making-buzzing-noise.html

Transmission leak on Toyota?

http://schematicsdiagram.blogspot.in/2012/02/transmission-leak-on-toyota.html

Location of transmission dip stick for 2003 Mercedes Benz C240?

http://schematicsdiagram.blogspot.in/2012/02/location-of-transmission-dip-stick-for.html

1990 ford fiestiva transmission dipstick location?

http://schematicsdiagram.blogspot.in/2012/02/1990-ford-fiestiva-transmission.html

Where is Transmission Dipstick located on 2001 Volvo c70?

http://schematicsdiagram.blogspot.in/2012/02/where-is-transmission-dipstick-located.html

1993 Ford Escort Transmission dipstick location?

http://schematicsdiagram.blogspot.in/2012/02/1993-ford-escort-transmission-dipstick.html

Automatic transmission, with no reverse?

http://howtobyme.blogspot.in/2012/02/automatic-transmission-with-no-reverse.html